The moraine that marks the farthest advance of a glacier is called a terminal moraine.

Here's a breakdown:

* Moraine: A moraine is a landform made up of glacial debris (rocks, sediment, and soil) that has been transported and deposited by a glacier.

* Terminal Moraine: This specific type of moraine forms at the glacier's furthest point of advance. As the glacier melts and retreats, it leaves behind a pile of debris at its furthest extent.

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